Hook block



FIG. 1 is a rear view of my hook block according to my new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a top perspective view thereof;

FIG. 5 is a bottom perspective view thereof;

FIG. 6 is a left-side view thereof;

FIG. 7 is a right-side view thereof; and,

FIG. 8 is a top view thereof.

The broken lines in the figures show portions of the hook block, which form no part of the claimed design. 

CLAIM The ornamental design for a hook block, as shown and described. 